Volume 123, Number 3, August 2018
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 September 2018|
Repulsive Fermi gases in a two-dimensional lattice with non-Abelian gauge fields
1 School of Science, Jiangnan University - Wuxi 214122, China
2 Department of Physics and Astronomy, University of Pittsburgh - Pittsburgh, PA 15260, USA
3 Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA
Received: 11 May 2018
Accepted: 3 August 2018
Motivated by the recent experiment realizing bidirectional spin-orbit–coupled Bose-Einstein condensates (BEC), we theoretically explore the properties of repulsive fermions in the two-dimensional (2D) optical lattice with such non-Abelian gauge fields. Within the mean-field level, we find a novel phase of topological antiferromagnetic (TAFM) order which incorporates both the non-trivial topology due to spin-flip hopping and spontaneous symmetry breaking (SSB) for the in-plane spin order. We argue that the appearance of such a phase is generic for repulsive fermions in Chern bands achieved through spin-orbit coupling. Our work paves the way for further studies of fermionic generalization of 2D non-Abelian spin-orbit–coupled quantum gases.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 75.70.Tj – Spin-orbit effects
© EPLA, 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.